Rod-packing.



No. 654,54I. Patented July 24. I900.

T. H.'HOLMES.

BOD PACKING. li a:

(Na Model.)

THOMAS H. HOLMES, OF WILKES-BARRE, PENNSYLVANIA.

ROD-PACKING.

SPECIFICATION forming part of Letters Patent No. 654,541, dated July 24,1900.

' Application flied February 14,1898. senate. 670.211. (momma) packing,furthermore, will accommodate itself to the rod as it wears, insuring asteamtight fit.

In the accompanying drawings, Figure 1 is a sectional view of myimproved metallic packing, showing the piston-rod in place.

Fig. 2 is a plan view of one of the packingrings. Fig. 3 is a plan Viewof the other packing-ring. Fig. 4 is a perspective view showing thesections of the ring, Fig. 2, de tached and Fig. 5 is aperspective Viewshowing the sections of the ring, Fig. 3, detached.

Referring to the drawings, A is the packing-casingadapted to be securedto or form part of the head of a cylinder or valve-chest. A is a capadapted to the casing and secured thereto by bolts a or otherfastenings.

B in the present instance is a piston-rod which passes freely throughthe casing and cap.

D is one of the sectional rings, and E is the other sectional ring. ablyplaced nearest to the piston, as shown in Fig. 1. I have found that thetwo rings D and E, made in accordance with my invention, applied to apiston-rod'will prevent the escape of steam and yet allow the rod towork freely, although I may use a number of pairs of rings, if desired.The ring D in the present instance is made up of six sections. The

sections d d cl are identical in form, being shaped as shown in thedrawings, having a curved base adapted to fit the piston-rod B andtapered toward the end 01 Resting against the inclined surface of two ofthese sections d are semicircular sections (1, of the shape illustratedin the drawings. A groove is formed in thesemicircular side of the sec-The ring E is prefer-' tion 62, as well as in the end d of the section(I, and when the several sections are assembled, as shown in Fig. 2, thegroove is continuous, and adapted to the groove is a spring G, tendingto press the several sections toward the piston-rod. The sections clbeing on such a bevel that as pressure is applied to the sections d andto the end d of the sections 01 these sections cl will be pressed snuglyagainst the rod. Extending from the center of the section d are lugs 61,which have curved faces corresponding to the curve of the piston-rod andof such length that they will rest against the rod when the sections areassembled, as shown in Fig. 2. These lugs rest in notches or grooves dformed in the sections at, so that steam is prevented from escapingbetween the sections cl cl. The ring E is made in three sections, asshown in Figs. 3 and 5, and the sections abut on radial lines. In orderto prevent the steam escaping between the joints of the sections, 1 formgrooves c in the ends of each section e and place within the grooves aplate 6 having its end curved to coincide with the curve of thepiston-rod. This plate is of such a length that the spring H, which isadapted to the annular groove e will not only tend to force the sections6 toward the rod, but will also tend to force the plates 6 against therod. By placing this pair of rings together in the packing-box, as shownin Fig. 1, the two rings break joints, so as to make it impossible forsteam to escape through the box when the rings are in position, and byhaving the ring E, with the radial partinglines, arranged next to thesteam any steam escaping through the part ing-lines will enter the spacebetween the peripheries of the rings and the casing and will press uponthe peripheries of the rings holding the several sections to the rod.

In order to keep the two rings in a certain position in respect to eachother, a projection c on one of the sections (1 of the ring D enters aspace between two of the sections 6 e of the ring E, as shown.

It will be understood that while I have shown the ring D made with threeinner and three outer sections they may be made in as many sections asshall by the angularity of their faces cause the segments to be forcedtoward the center by the circumferential pres too sure of a spring,either of the spiral form or flat form or by other pressure.

Packing of this type can be used on a reciprocating rod or one thatvibrates or rotates.

I preferably make the lugs d in the form of T-headed pins set into theface of the section d after they are finished; but they may be madeintegral with the sections, if necessary.

When theinner sections (I wear by continued use until their ends touch,I can remove these sections, grind off the ends, so that they willclear, and deepen the grooves 61 for the lugs 61 The packing will thenbe as good as new.

I prefer to use a spiral spring around the peripheries of the rings, asit conforms more readily to the irregularities of the sections.

I claim as my invention- 1. The combination in a packing-ring forpiston-rods, of a series of inner sections adapted to encircle the rod,said inner sections being tapered toward the periphery of the ring, anda series of outer sections in the form of segments, each outer sectionadapted to rest against the faces of two of the inner sections, a lugextending from the center of each outer section toward the piston-rod,the ends of the inner sections being grooved to receive the lugs, with aspring encircling the ring and bearing upon the inner and outersections,

substantially as described.

2. The combination in a packing, of two or more rings, one ring dividedinto a series of '35 a plate adapted to the grooves so as to make thejoint between the sections steam-tight, each of said sections having agroove, with a spring mounted in said groove and bearing upon the platesas well as upon the sections, substantially as described.

3. The combination in a packing, of a casing of one or more sets ofrings, each set consisting of two rings, one ring divided into a seriesof sections on radial lines, each section having grooved edges, withplates adapted to rest in the grooves the said ring having an annulargroove, a spring therein tending to force the sections and the platestoward the rod, the other ring made up of three inner sections separatedfrom each other on radial lines, and three outer sections separated fromthe inner sections on tangential lines, a lug on each outer sectionextending into grooves in the ends of the inner sections and adapted torest against the rod, the said ring having an annular groove and aspring in said groove tending to force the sections upon the rod,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

THOMAS. H. HOLMES.

Witnesses:

F. E. BEOHTOLD, J os. H. KLEIN.

